Abstract
In recent years, the large-scale promotion of new energy technologies and electric vehicles, the continuous development of energy storage technology, the rapid decline in the cost of energy storage, plus the value of energy storage for increasing the power system's peak and frequency regulation capacity and spatial flexibility in time has a very significant role, the promotion of energy storage in the power system will certainly be the future trend. At the system level in the integrated energy region, the overall control strategy for energy storage assisted frequency regulation can be divided into a control strategy where energy storage is involved in primary frequency regulation alone and a compensating control strategy where the energy storage output is adjusted according to the unit output. At the device level in the integrated energy area, the voltage and current double closed-loop control strategy and the PQ control strategy are used to achieve precise control of the overall input and output power of the energy storage system according to the circuit structure of the bi-directional DC/DC converter and inverter and the physical constraints of the control object.
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